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diff --git a/1514/CH16/EX16.5/16_5.sce b/1514/CH16/EX16.5/16_5.sce
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+//chapter 16
+//example 16.5
+//page 484
+clear all;
+clc ;
+//given
+Vs=15;//dc supply 
+Vref=6;
+printf("\nSuitable device is 1N753,from datasheet")
+Vz=6.2;//nominal voltage
+P=400;//nominal power in mW
+Izmin=5;
+Izm=P/Vz;//Izm=Ilmax+Izmin
+R1=10^3*(Vs-Vz)/Izm;
+printf("\nseries resistance R1=%d ohm,use standard value 150 ohm",R1);R1=150;
+Izm=1000*(Vs-Vz)/R1;
+Ilmax=Izm-Izmin;
+printf("\nMax load current =%d mA ",ceil(Ilmax))
+
+
+